nfsd: fix memory corruption caused by readdir

If the result of an NFSv3 readdir{,plus} request results in the
"offset" on one entry having to be split across 2 pages, and is sized
so that the next directory entry doesn't fit in the requested size,
then memory corruption can happen.

When encode_entry() is called after encoding the last entry that fits,
it notices that ->offset and ->offset1 are set, and so stores the
offset value in the two pages as required.  It clears ->offset1 but
*does not* clear ->offset.

Normally this omission doesn't matter as encode_entry_baggage() will
be called, and will set ->offset to a suitable value (not on a page
boundary).
But in the case where cd->buflen < elen and nfserr_toosmall is
returned, ->offset is not reset.

This means that nfsd3proc_readdirplus will see ->offset with a value 4
bytes before the end of a page, and ->offset1 set to NULL.
It will try to write 8bytes to ->offset.
If we are lucky, the next page will be read-only, and the system will
  BUG: unable to handle kernel paging request at...

If we are unlucky, some innocent page will have the first 4 bytes
corrupted.

nfsd3proc_readdir() doesn't even check for ->offset1, it just blindly
writes 8 bytes to the offset wherever it is.

Fix this by clearing ->offset after it is used, and copying the
->offset handling code from nfsd3_proc_readdirplus into
nfsd3_proc_readdir.

(Note that the commit hash in the Fixes tag is from the 'history'
 tree - this bug predates git).

Fixes: 0b1d57cf7654 ("[PATCH] kNFSd: Fix nfs3 dentry encoding")
Fixes-URL: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=0b1d57cf7654
Cc: stable@vger.kernel.org (v2.6.12+)
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

2 files changed, 15 insertions, 2 deletions

diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index 9eb8086ea841..c9cf46e0c040 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -463,8 +463,19 @@ nfsd3_proc_readdir(struct svc_rqst *rqstp)
                                         &resp->common, nfs3svc_encode_entry);
         memcpy(resp->verf, argp->verf, 8);
         resp->count = resp->buffer - argp->buffer;
-        if (resp->offset)
-                xdr_encode_hyper(resp->offset, argp->cookie);
+        if (resp->offset) {
+                loff_t offset = argp->cookie;
+
+                if (unlikely(resp->offset1)) {
+                        /* we ended up with offset on a page boundary */
+                        *resp->offset = htonl(offset >> 32);
+                        *resp->offset1 = htonl(offset & 0xffffffff);
+                        resp->offset1 = NULL;
+                } else {
+                        xdr_encode_hyper(resp->offset, offset);
+                }
+                resp->offset = NULL;
+        }
 
         RETURN_STATUS(nfserr);
 }
@@ -533,6 +544,7 @@ nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
                 } else {
                         xdr_encode_hyper(resp->offset, offset);
                 }
+                resp->offset = NULL;
         }
 
         RETURN_STATUS(nfserr);
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index 9b973f4f7d01..83919116d5cb 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -921,6 +921,7 @@ encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
                 } else {
                         xdr_encode_hyper(cd->offset, offset64);
                 }
+                cd->offset = NULL;
         }
 
         /*